Investigators said they were notified about a report from parents in St. Cloud that their children may have been abused by 63-year-old Robert Grafton.

The parents said they met Grafton several years ago when they all lived in the same motel in Kissimmee, the news release said.

Grafton, who has been a register sex offender in Osceola County since February 2011, would buy the children clothing, give them money and bought them cellphones, according to deputies.

Authorities said the parents were unaware that Grafton was a sex offender.

The family was having financial issues and lived with Grafton for a while at his St. Cloud home, officials said.

According to a news release, the parents recently noticed that their sons, ages 13 and 14, did not want to have any contact with Grafton, and then a family friend notified them that he was a sex offender.

The children told deputies that they had been sexually battered by Grafton since August 2012, investigators said.

Grafton is charged with 102 counts of sexual battery, 25 counts of lewd and lascivious battery and 30 counts of lewd and lascivious conduct. He served 15 years in prison in Penn. for a similar crime.

See the Florida counties with the most people listed as "sexual predators." A sexual predator is a person who has been convicted of a sexually violent offense as defined in Florida Statute 775.21. Under Florida law, sexual offenders are considered to pose a high risk of engaging in sexual offenses even after being released from incarceration or commitment.